Just drove 1000 miles last week. I got 29 MPG (maybe a slight tail wind) from Albuquerque to Denver. On the way back (with 40 mile per hour head wind) only 25 MPG. All driving was at 75 or 65 MPH. Very pleased with MPG.

I just completed a 390 mile round trip from Indianapolis to Columbus and back on I 70 at 26.9mpg with an average speed of 74 mph on my 2003 LS430. The mpg was calculated on similiar filled tanks of Shell premium. Winds were out of the west between 10--15 kts both ways.The car computer said the mileage was 27.1 mpg. Great car !! I have 29,900 miles on it and I will be putting Michelin MXV 4 tires on it next week.I have to replace the OEM Dunlops due to poor wear. I am really looking forward to driving it with the Michelin tires!

I would get about 19.5 in combined driving. About 24 going 75-80mpg. I was pretty impressed actually. These numbers are from the trip computer. I didn't calculate myself. I recently switched to an 2006 M35 AWD. It only gets about 16.5 using a V6 so the LS looks pretty impressive!

Just wonder if Michelin Tires are better than Toyo Tires. I have Dunlop tires on my 2004 LS and have approx 25,000 miles on it and seem to have plenty of rubber on them so far.I put ToyoTires on my 97 LS but traded it off soon after, so don't know how they lasted.Jerry5506

With the cost of gasoline rising, yesterday I decided to see how the mpg would be going 65 on the interstate instead of the posted 70 mph limit. I cleared the numbers on the display and strictly on the interstate got 30 mpg. That is with no stop/start driving and no major hills.

Is it kosher to use regular gas for constant speed long distance driving? I know if I hear the engine pinking that the answer is no. If I use a light foot on the gas pedal and use the cruise control will I be doing any harm to the engine?

I am in the middle of an extended road trip with mostly interstate hwy driving, and on one tank I got 28.4mpg and on the next I got 27.5mpg. I can't account for the difference; if anything, the speeds driven were lower on the second tank. Maybe it's the brand of gasoline. Still, this is pretty good mileage for a car of this size and weight, I think. So much for the claim that nobody can get mileage as high as the EPA estimates. In town I typically get 18-19mpg.

I asked my service manager this question - he returned a question to me: How long do you expect to drive the car? His feeling is if you are only going to drive the car for 100,000 miles or so, then use regular - if you intend to keep it longer, use premium. He said he's seen LS models with very high mileage (300k +) that have not yet had major engine work, excepting engine accessory replacements, and he attributes it in part to use of premium fuel. So if this is in fact the case, wouldn't it be nice to know, if buying a used vehicle, what fuel has been used in it? Another good reason for not buying an LS from a rental fleet. You can be certain they live on a regular-grade diet. So I tend to buy the more expensive stuff, always wondering if I'm throwing money away in so doing.

You are getting "only" 24.5 mpg on your FIRST tank? In my humble opinion, you are doing pretty well. Remember you are driving a luxury V8, not some econo-box four cylinder. Read the Infiniti M boards. Most of them are getting 16-19 mpg on a V6. Don't blame the California gasoline. Be thankful that in addition to getting great gas mileage vs. almost any other peer automobile, you are also helping the environment.

I have taken a number of trips between Oregon and Washington along the interstate. Quite consistently, like you, I am averaging about 24.5 MPG with a 1990 LS burning premium gas at 70-75 MPH (When not stuck in traffic.)

where do you live? I think octane is also frequently a factor in the altitude of the location. When I lived near Denver, 91 was all you could get. Now I live in Maryland and here, as well as most of the (low altitude) east coast, the octane is 93 at pretty much all stations/brands. I also used to note 91 octane in WY and UT - again mostly high altitude locations.

My wife drives her 2006 LS430 about 99.5 % , the rest of the time I drive it, to put gas in it.This past time , while distracted by this beautiful , young , attractively dress blond , I push the Regular gas , and so far my wife has not notice the difference but for me , I want to gas up everyday at the same time.This was an accident ( the Gas ) , the next time back to High Octane, just the car.

The fleet reference was incidental to the topic of the proper fuel to use. However, as a matter of information I have rented a Lexus ES from Thrifty Car Rental in Los Angeles as well as an LS from Midway Car Rental. They may no longer offer rentals, I don't know. But - if you cannot buy a Lexus from a fleet, rental or otherwise, how does the rental company eventually dispose of the vehicle?

Just got back two days ago from a road trip. The car was loaded with 4 adults (3 who drove) and a trunk full of luggage. I calculated the mileage on paper instead of the computer as I didn't want to zero everything out. 1780.3 miles 68.95 Gals at a total cost of $281 - 25.8 MPG. We paid between $3.919 and 4.219 for high test. Also this raised my average MPG two tenths on the 'puter. It now sits at 22.4 MPG.

The car has low mileage, about 80,000 miles. I have to say I am very pleased with the MPG. It easily holds four people and a hugh pile of stuff. Fully loaded it's a quiet, smooth, very comfortable ride and the mileage is wonderful for what we have.

I was toying with buying something new next year, but for the value I am re-thinking. I may just keep my trouble free car.